Have you thought about phoning round Maltese Rescues and bringing a young dog into your home? I know when I was looking at getting another I decided on not getting a pup because of the work that is involved and also the time I needed to split between Gypsy, Amelia, the new puppy and also the house work, not to mention the few minutes I get to spend on myself each day. I also thought of when Amelia would be mobile and the puppy still not being very big and if she fell on the puppy she could really hurt it, plus I didn't like the idea of little puppies jumping up her or nipping at her feet while she's crawling/walking and also the little accidents that puppies leave everywhere that I would hate for Amelia to go crawling, walking or falling into.
They are my thoughts and opinions though and not everyone feels the same, I was just worried for Amelia and a small puppies safety and didn't like the idea of having to confine a puppy to an area most of the day while Amelia is playing.
Maybe this is something you could also consider... I know I felt really good about myself bringing Kayla into our home and giving her a secure home which she'd never known before.
Otherwise, look on the Kennel Club website for accredited breeders and look on YT's sister site
MalteseTalk there are UK members on there also.